Water Supply Situation in the Crystalline Hydrogeological Province of Northern Nigeria: A Case Study of Nasarawa Town and Environs, Northcentral Nigeria
M. A. Kana, K. Schoeneich, M. L. Garba

This study focuses on the piped water supply to Nasarawa town of about 100,000 residents in north central Nigeria. Hydrogeological mapping of the area entailed location of rock outcrops and measurements of ground water table in hand dug wells. The area is underlain by the Precambrian Basement Complex Crystalline rocks such as schist, gneiss, migmatiteandgranite. These rocks are dominantly fractured in NNE-SSW and NSdirections. These structures have effect on the drainage pattern and influence both the groundwater and surface water flow directions in the area. Static water resources of the Nasarawa dam drainage basin upstream from the embankment are1, 814x 106 m3. Total dynamic water resources are 90,547,182 m3/a out of which 45,273,591 m3/a, are utilizable dynamic water resources while the remaining 45,273,591 m3/a, are non-utilizable dynamic water resources. Current water demand in Nasarawa town and environs is 4.0 x 106 m3/a while the ultimate water demand was estimated at22.5 x 106 m3/a. Groundwater in the study area is enough to supplement surface water to meet the current as well as the future water demand of people in the area.

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